Geared turbine installation



Dec. 5, 1933. E. H. B. ANDERSON GEARED TURBINE INSTALLATION Filed July9, 1929 4 Sheets-Sheet 1 Dec. 5, 1933. E, H. ANDERSON 7 1,938,365

GEARED TURBINE INSTALLATION Filed July 9, 1929 4 Sheets-Sheet 2 1 15 J1JL 4 h A L221]; 1 If 41 2 I M ya Dec. 5, 1933. E. H. B. ANDERSON GEAREDTURBINE INSTALLATION 4 Sheets-Sheet 3 Filed July 9, 1929 fi6 2 hdd Q 5 i1". J H N Wu X w Fm w kl l. 5 \w H. m r.| wh X 0 VL 0 4 a mm a? ME 1933-E. H. B. ANDERSON GEARED TURBINE INSTALLATION Filed July 9, 1929 4Sheets-Sheet 4 Fig.7. w CZVMV MAf-MW a a? I Patented Dec. 5, 1 933UNITED STATES PATENT OFFICE GEARED TURBINE INSTALLATIQN Application July9, 1929, Serial No. 376,943, and I Y in Great Britain July 17, 1928 5 7Claims.

The invention relates to geared turbine installations of the'type inwhich a number of turbines drive pinions gearing with a common wheel.

A main object of the present invention is to improve the structuralfeatures of such an installation with a view to facilitating overhaul orreplacement of parts.

With this and other objects:

The invention consists in a casing for a geared turbine installation ofthe kind indicated having a plurality of turbines, and preferably forsuch an installation in which the axes of two of the turbines aresituated in a plane passing through the axis of the main gear wheel, theaxis or axes of the other turbine or turbines being situated at a higherlevel and in the case of two turbines preferably in a plane parallel tothe first-mentioned plane.

The invention also consists in the improved turbine installations andcertain structural details thereof to be hereinafter described orindicated.

Referring to the accompanying diagrammatic drawings, which show one formof the invention by way of example:-

Figure 1 shows a plan View of a two-plane fourpinion geared turbineinstallation with the casing cover removed,

Figure 2 being a corresponding side elevation of the casing,

Figure 3 shows an end View of the casing looking aft,

Figure 4 being a section on the line 4-4 of Figure 3,

Figure 5 shows a section on the line 55-55 of Figure 6, while Figures 6and '7 are sections respectively on the lines 6-6 and 7-7 of Figure 5.

The same reference symbols are used in the different figures to denotecorresponding parts.

In carrying the invention into effect according to the illustrativeform'shown, applied by way of example to a marine turbine installation,the shafts of a high pressure, first intermediate pressure, secondintermediate pressure, and low pressure turbine, A, B, C, D, hereinafterreferred to respectively as H. P., I. P., first I. P., second I. P. andL. P. turbines, are coupled respectively to pinion shafts a, b, c, and(1, each having formed integrally therewith a pinion gearing with acommon gear wheel mounted on the propeller shaft, and consisting of twohelical wheels, e e one right-hand and one left-hand spaced apart, eachpinion being also divided into righthand and left-hand sections, a a bb, 0 c

and d d spaced apart to mesh respectively therewith. In this way, ashereinafter described, each pinion shaft may be provided with threebearings, a a a b b b and so forth, one between the two pinion sectionsand the others outside the right-hand and left-hand pinion respectively.

Of the four turbines, the axes of the L. P. and 1st I. P., D and B, liein the horizontal plane passing through the axis of the main gear wheel,symmetrically one on each side of the axial vertical plane therethrough,while the axes of the H. P. turbine,.A, and the 2nd I. P. turbine, C,lie in a parallel plane above the axis of the main gear wheel andsimilarly one on each side of the axial vertical plane.

In addition, the H. P. turbine, A, and the 1st I. P. turbine, B, arearranged on the forward side of the main gear wheel while the 2nd I.P.'and L. P. turbines, C and D, are arranged on the after side of themain gear wheel.

With this arrangement, it will be seen that the two turbines on theforward side-and the two turbines on the after side of the main gearwheel are respectively at different levels so that the upper one of eachpair can drain by gravity into the lower one.

The LP. turbine, D, may be of the double-flow type and embody in itsstructure the L. P. section, D of an astern turbine, the correspondingH. P. section, C of the astern turbine being associated with the 2nd I.P. turbine, C.

As regards the'structural features of such an installation, the casingor housing of the gear wheels comprises a lower base portion, h, of ahollow quadrangular form as seen in plan extending upwardly to thehorizontal plane passing through the axis of the main gear wheel andprovided with bearings, e e therefor and also bearings b 12*, b and d d(1 for the pinion 95 shafts, b, d, of the 1st I. P. and L. P. turbines,B and D, these bearings being arranged respectively in the end walls, hh and on brackets, M, inwardly projecting from the longitudinal walls ofthe quadrangle into the space between the two sections, e e of the maingear wheel.

All the bearings are provided with suitable caps.

To support the pinion shafts, a, c, situated in the second plane, theupper part of the gear casing is formed as a girder structure extendingupwardly from the top of the base portion, 71, to which it is attachedby any convenient means, and arching over the main gear wheels. Thisgirder structure comprises end walls, h m, a hollow transverse wall, hpartly supported by the brackets, 72. and situated between the twosections of the gear wheel, 6 e and a shell, h", the top of which isprovided with bearings, a a a and c c 0 for the pinion shafts, a and c,of the H. P. and 2nd I. P. turbines, A and C, respectively.

As before, three bearings are provided for each such pinion withsuitable caps to hold the pinion shafts in place. I

The girder structure described is conveniently constructed in two partsbolted together in a vertical plane passing through the axis of theshaft, 1.

In order to provide for overhaul or replacement of the 1st I. P. and L.P. pinion shafts, b and d, the central transverse girder, h of the upperpart of the casing structure is provided with arched recesses, h intowhich the caps or pinion shafts, b, it, themselves may be raised forwithdrawal, access being obtained to these parts by apertures, it,through the casing wall, n fitted with detachable covers, h With asimilar object, apertures, 71, corresponding to such recesses are alsoprovided in the end walls, h I1 and are fitted with detachable plates,71 with which may be embodied the upper halves, h, of the pinion shafthousings and it may be also the facings, h or parts of them, hereinafterdescribed for the attachment of the relative turbines.

Similar detachable plates and adjuncts are pref erably fitted in respectof the shaft, f.

as required to give it the necessary strength and in addition isprovided with facings, 71. on its two end walls for the attachment ofthe relative turbines, the whole power unit thus being em bodied in asingle rigid structure.

Further, the quadrangular base portion of the frame is supported onstiffened seatings, i, i, in the ships structure and is preferablyenclosed below, for example by a light trough, ic, or the like of sheetmetal.

With a structure as described, fhe macjhine workand boring out of thedifferent bearings is readily accomplished by ordinary workshop methodswhile easy access is afforded to all the pinion shafts for inspectionandoverhaul.

The same general arrangement may be used either with pinicns of the samesize or with pinions of different sizeto provide for different speeds ofrunning of the various turbine sections,

Alternatively, instead of the preferred arrangement of double-helical.teeth as described, the same set of turbines may be used in connection Iwith single helical teeth,-the thrust reactions, be-

ing taken up by the turbine blading, by dummy pistons or otherwise.

Finally, a casing as described may be readily modified to provide forthe case of a three-pinion installation in which only one pinion shaftis arranged in. the upper plane.

It will. be seen that other arrangements of the different turbinesections may be used and the structural details of the gear casing maybe varied without exceeding the scope of the invention as defined in theclaims appendant hereto.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:--

l. A turbine gear casing comprising a base portion provided withbearings for the main gear wheel shaft and for two turbine pinion shaftssubstantially in the same horizontal plane with the main gear wheelshaft, and a detachable upper portion provided with bearings for atleast one turbine pinion shaft, said upper portion including end wallsand a transverse hollow wall provided with recesses into which the lowerpinion shafts may be raised for endwise withdrawal of the pinion shafts.

2. A turbine gear easing as claimed in claim 1, in which the detachableupper portion consists of an intermediate casing element providing thelower bearings for the upper pinion shafts and atop cap forming a thirdcasing element and providing upper bearings for the upper pinion shafts.

3. A turbine gear casing comprising a quadrangular base portion havinginterior brackets and provided with bearings for the main gear wheelshaft and two turbine pinion shafts, and a detachable upper portionprovided with bearings for at least one turbine pinion shaft and havingend walls, a shell, and an intermediate hollow transverse wall supportedby said brackets.

4. A turbine gear casing comprising a base portion provided withbearings for the main gear wheelshaft and two turbine pinion shafts, anda detachable upper. portion provided with bearings forat least oneturbine pinion shaft and having end walls, a shell and an intermediatehollow transverse wall, said end walls and transverse wall beingprovided with recesses into which the lower pinion. shafts may be raisedfor endwise withdrawaL, and detachable plates in said recesses formingthe upper halves of the bearings for the lower turbine shafts.

5. A turbine gear casing comprising a lower portion, a removable upperportion, bearings on the lower portion adapted to support a gear wheelformed of elements spaced apart, bearings arranged to extend outside ofand between'the elements and adapted to support pinions formed ofelements spaced apart, and an intermediate hollow transverse wallcarried by the upper portion of the casing and arranged to extendbetween thetwo elements of the main gear wheel, said transverse wallcarrying the intermediate bearings for the pinion shafts.

ERNEST H. B. ANDERSON.

